Import windchill Extension (TW_Download_PTC Windchill Extension.zip) occure error ?

Hello ,

I am getting error to import windchill extension Error occurred in Importing two extension ptc-windchill-connection-extension.zip and ptc-identity-provider-authenticator-extension.zip

Error like " cvc-complex-type.3.2.2: Attribute 'migratorClass' is not allowed to appear in element 'ExtensionPackage'. "

Please let me know any solution of this error.

My Thingworx version is 6.6.3

Thanks ,

Mayank